The concept that people hoarding Bitcoin is a problem for Bitcoin adoption.

See:

• I’m Hoarding Bitcoins, and No You Can’t Have Any
• Investor Fred Wilson: Security and Hoarding Are Holding Back Bitcoin
• Bitcoin Doesn’t Have a Deflation Problem
• Deflationary spiral

Source

http://bitcoin.it/

See Also on BitcoinWiki

• Cruisebit
• SupplyBloc
• NOIA Network
• 4NEW
• CBDoken